from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A stable, corrosion-resistant zirconium alloy.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a set of specialist alloys of zirconium
A CANDU fuel assembly consists of a bundle of 37 half-meter-long fuel rods (ceramic fuel pellets in zircaloy tubes) along with a support structure, with 12 bundles lying end to end in a fuel channel.
The fuel pellets (usually about 1 cm diameter and 1.5 cm long) are typically arranged in a long zirconium alloy (zircaloy) tube to form a fuel rod, the zirconium being hard, corrosion-resistant and permeable to neutrons.
They are different from the ceramic UO2 pellets enclosed in zircaloy cladding used in power reactors.
Fuel: Pellets of slightly-enriched uranium oxide are enclosed in a zircaloy tube 3. 65m long, forming a fuel rod.
The light water breeder reactor (LWBR) concept was also successfully tested here from 1977 to 1982 with thorium and 233U fuel clad with zircaloy using the 'seed/blanket' concept.
The cylindrical UO2 pellets are stacked and encapsulated in thin walled tubes of zirconium alloy, both ends of which are sealed by resistance welding using zircaloy end plugs. 19 such fuel pins are assembled to form a fuel bundle for PHWR 220 MWe.
Hanford workers have dug three trenches there used to dispose of debris from research and fuel fabrication at Hanford, including huge stainless steel tanks and drums of zircaloy chips.
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